linux-kernel - Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP

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Message-ID: <xa1tlgk9c3j4.fsf@mina86.com>
Date:   Tue, 17 Oct 2017 15:22:39 +0200
From:   Michal Nazarewicz <mina86@...a86.com>
To:     Guy Shattah <sguy@...lanox.com>, Michal Hocko <mhocko@...nel.org>
Cc:     Christopher Lameter <cl@...ux.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "linux-mm\@kvack.org" <linux-mm@...ck.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-api\@vger.kernel.org" <linux-api@...r.kernel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Laura Abbott <labbott@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support

On Tue, Oct 17 2017, Guy Shattah wrote:
> Are you going to be OK with kernel API which implements contiguous
> memory allocation?  Possibly with mmap style?  Many drivers could
> utilize it instead of having their own weird and possibly non-standard
> way to allocate contiguous memory.  Such API won't be available for
> user space.

What you describe sounds like CMA.  It may be far from perfect but it’s
there already and drivers which need contiguous memory can allocate it.

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»